Revenue Recognition - Additional Information (Details)	3 Months Ended
	Mar. 31, 2019
Consumer Customers
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Length of customer life	30 months
Business Customer
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Length of customer life	49 months
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract term	1 year
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract term	7 years